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I suspect it's because the file is emailed to USA, who then set it using their own house font, size and leading, title pages etc (and probably run spell-check over it to convert spelling to US).
All it takes is slightly different margins, slightly different type size, and perhaps different layouts for chapter breaks (some always start new chapters on new pages, some don't) and Bob's your auntie (or relative of your choice, as Terry Pratchett would say).
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